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20 Jul 2013, 19:17

Please can anyone help me with my following query. I am very confused

Number x has increased by 100% ??Number x has increased by a factor of 20 ??Number x has decreased by a factor of 15??Number x has an increase of 100% ??Number x has increased to y ??Number x has increased by y ??

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20 Jul 2013, 22:46

2

This post receivedKUDOS

Number x has increased by 100% ?? => X as doubled 10->20Number x has increased by a factor of 20 ?? => x has increased by 1,2,4,5,10,20. I do not know if this is a percentage increase(+20%) or a multiplication(x20) or a sum(+20); I think that the latter should be correct.Number x has decreased by a factor of 15??=> x has decreased by 1,3,5,15, same as aboveNumber x has an increase of 100% ??=> same as the first oneNumber x has increased to y ??=> example x=5, y=7; x has increased to y==> x=7Number x has increased by y ??=> example x=5, y=7; x has increased by y==> x=5+7=12

Hope this makes sense _________________

It is beyond a doubt that all our knowledge that begins with experience.

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Number x has increased by a factor of 20 ?? => x has increased by 1,2,4,5,10,20. I do not know if this is a percentage increase(+20%) or a multiplication(x20) or a sum(+20); I think that the latter should be correct.

Number x has decreased by a factor of 15??=> x has decreased by 1,3,5,15, same as above

Number x has an increase of 100% ??=> same as the first one

Number x has increased to y ??=> example x=5, y=7; x has increased to y==> x=7

Number x has increased by y ??=> example x=5, y=7; x has increased by y==> x=5+7=12

Hope this makes sense

The red parts are not correct.

Increases by a factor of y means multiplied by y --> x increased by a factor of 20 --> result = 20x.

Decreased by a factor of y means divided by y --> x decreased by a factor of 15 --> result = x/15.

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Number x has increased by 100% ??Number x has increased by a factor of 20 ??Number x has an increase of 100% ??Number x has increased to y ??Number x has increased by y ??

Solutions:

Number x has increased by 100%x has increased by 100% of x i.e. x has become double of what it was originally. If x was 10, it is now 20.

Number x has increased by a factor of 20"increased by a factor of 20" means "multiplied by 20" (yes, kind of un-intuitive because I might expect it to INCREASE by 20x to become 21x but that is not the way it is used)So x becomes 20x

Number x has an increase of 100% ??Not usually used. We use "x has increased by 100%". It means x has becomes 2x.

Number x has increased to y ??x has become y. Number of children (which has 5) has increased to 10 (now there are 10 children).

Number x has increased by y ??y is added to x to give x + y. Number of children (which was 5) has increased by 10 (now there are 15 children).
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